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rtlanal.c (commutative_operand_precedence): Correct comments. 

* rtlanal.c (commutative_operand_precedence): Correct comments.
	* simplify-rtx.c (simplify_plus_minus_op_data_cmp): Delete forward
	declaration.  Return an int.  Distinguish REG,REG return from
	others.
	(struct simplify_plus_minus_op_data): Make local to function.
	(simplify_plus_minus): Don't set canonicalized if merely sorting
	registers.  Avoid packing ops if nothing changes.  White space fixes.

From-SVN: r224768
This commit is contained in:
Alan Modra 2015-06-23 10:35:04 +09:30 committed by Alan Modra
parent 6536a0a875
commit 350911e651
3 changed files with 78 additions and 47 deletions
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10
gcc/ChangeLog
View File

@ -1,3 +1,13 @@
2015-06-23 Alan Modra <amodra@gmail.com>
* rtlanal.c (commutative_operand_precedence): Correct comments.
* simplify-rtx.c (simplify_plus_minus_op_data_cmp): Delete forward
declaration. Return an int. Distinguish REG,REG return from
others.
(struct simplify_plus_minus_op_data): Make local to function.
(simplify_plus_minus): Don't set canonicalized if merely sorting
registers. Avoid packing ops if nothing changes. White space fixes.
2015-06-22 Pierre-Marie de Rodat <derodat@adacore.com>
* gcc.c (default_compilers): Pass "-o %g.s" to cc1 for headers even if

9
gcc/rtlanal.c
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@ -3132,17 +3132,16 @@ regno_use_in (unsigned int regno, rtx x)
}
/* Return a value indicating whether OP, an operand of a commutative
operation, is preferred as the first or second operand. The higher
the value, the stronger the preference for being the first operand.
We use negative values to indicate a preference for the first operand
and positive values for the second operand. */
operation, is preferred as the first or second operand. The more
positive the value, the stronger the preference for being the first
operand. */
int
commutative_operand_precedence (rtx op)
{
enum rtx_code code = GET_CODE (op);
/* Constants always come the second operand. Prefer "nice" constants. */
/* Constants always become the second operand. Prefer "nice" constants. */
if (code == CONST_INT)
return -8;
if (code == CONST_WIDE_INT)

106
gcc/simplify-rtx.c
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@ -59,7 +59,6 @@ along with GCC; see the file COPYING3. If not see
static rtx neg_const_int (machine_mode, const_rtx);
static bool plus_minus_operand_p (const_rtx);
static bool simplify_plus_minus_op_data_cmp (rtx, rtx);
static rtx simplify_plus_minus (enum rtx_code, machine_mode, rtx, rtx);
static rtx simplify_immed_subreg (machine_mode, rtx, machine_mode,
unsigned int);
@ -4049,20 +4048,10 @@ simplify_const_binary_operation (enum rtx_code code, machine_mode mode,
/* Simplify a PLUS or MINUS, at least one of whose operands may be another
PLUS or MINUS.
/* Return a positive integer if X should sort after Y. The value
returned is 1 if and only if X and Y are both regs. */
Rather than test for specific case, we do this by a brute-force method
and do all possible simplifications until no more changes occur. Then
we rebuild the operation. */
struct simplify_plus_minus_op_data
{
rtx op;
short neg;
};
static bool
static int
simplify_plus_minus_op_data_cmp (rtx x, rtx y)
{
int result;
@ -4070,20 +4059,33 @@ simplify_plus_minus_op_data_cmp (rtx x, rtx y)
result = (commutative_operand_precedence (y)
- commutative_operand_precedence (x));
if (result)
return result > 0;
return result + result;
/* Group together equal REGs to do more simplification. */
if (REG_P (x) && REG_P (y))
return REGNO (x) > REGNO (y);
else
return false;
return 0;
}
/* Simplify and canonicalize a PLUS or MINUS, at least one of whose
operands may be another PLUS or MINUS.
Rather than test for specific case, we do this by a brute-force method
and do all possible simplifications until no more changes occur. Then
we rebuild the operation.
May return NULL_RTX when no changes were made. */
static rtx
simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
rtx op1)
{
struct simplify_plus_minus_op_data ops[16];
struct simplify_plus_minus_op_data
{
rtx op;
short neg;
} ops[16];
rtx result, tem;
int n_ops = 2;
int changed, n_constants, canonicalized = 0;
@ -4124,7 +4126,18 @@ simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
ops[i].op = XEXP (this_op, 0);
changed = 1;
canonicalized |= this_neg || i != n_ops - 2;
/* If this operand was negated then we will potentially
canonicalize the expression. Similarly if we don't
place the operands adjacent we're re-ordering the
expression and thus might be performing a
canonicalization. Ignore register re-ordering.
??? It might be better to shuffle the ops array here,
but then (plus (plus (A, B), plus (C, D))) wouldn't
be seen as non-canonical. */
if (this_neg
|| (i != n_ops - 2
&& !(REG_P (ops[i].op) && REG_P (ops[n_ops - 1].op))))
canonicalized = 1;
break;
case NEG:
@ -4145,7 +4158,7 @@ simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
ops[n_ops].neg = this_neg;
n_ops++;
changed = 1;
canonicalized = 1;
canonicalized = 1;
}
break;
@ -4158,7 +4171,7 @@ simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
ops[i].op = XEXP (this_op, 0);
ops[i].neg = !this_neg;
changed = 1;
canonicalized = 1;
canonicalized = 1;
}
break;
@ -4169,7 +4182,7 @@ simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
ops[i].op = neg_const_int (mode, this_op);
ops[i].neg = 0;
changed = 1;
canonicalized = 1;
canonicalized = 1;
}
break;
@ -4213,23 +4226,29 @@ simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
}
/* Now simplify each pair of operands until nothing changes. */
do
while (1)
{
/* Insertion sort is good enough for a small array. */
for (i = 1; i < n_ops; i++)
{
struct simplify_plus_minus_op_data save;
j = i - 1;
if (!simplify_plus_minus_op_data_cmp (ops[j].op, ops[i].op))
continue;
{
struct simplify_plus_minus_op_data save;
int cmp;
canonicalized = 1;
save = ops[i];
do
j = i - 1;
cmp = simplify_plus_minus_op_data_cmp (ops[j].op, ops[i].op);
if (cmp <= 0)
continue;
/* Just swapping registers doesn't count as canonicalization. */
if (cmp != 1)
canonicalized = 1;
save = ops[i];
do
ops[j + 1] = ops[j];
while (j-- && simplify_plus_minus_op_data_cmp (ops[j].op, save.op));
ops[j + 1] = save;
}
while (j--
&& simplify_plus_minus_op_data_cmp (ops[j].op, save.op) > 0);
ops[j + 1] = save;
}
changed = 0;
for (i = n_ops - 1; i > 0; i--)
@ -4258,7 +4277,8 @@ simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
tem_lhs = GET_CODE (lhs) == CONST ? XEXP (lhs, 0) : lhs;
tem_rhs = GET_CODE (rhs) == CONST ? XEXP (rhs, 0) : rhs;
tem = simplify_binary_operation (ncode, mode, tem_lhs, tem_rhs);
tem = simplify_binary_operation (ncode, mode, tem_lhs,
tem_rhs);
if (tem && !CONSTANT_P (tem))
tem = gen_rtx_CONST (GET_MODE (tem), tem);
@ -4296,20 +4316,22 @@ simplify_plus_minus (enum rtx_code code, machine_mode mode, rtx op0,
}
}
/* If nothing changed, fail. */
if (!canonicalized)
return NULL_RTX;
if (!changed)
break;
/* Pack all the operands to the lower-numbered entries. */
for (i = 0, j = 0; j < n_ops; j++)
if (ops[j].op)
{
if (ops[j].op)
{
ops[i] = ops[j];
i++;
}
}
n_ops = i;
}
while (changed);
/* If nothing changed, fail. */
if (!canonicalized)
return NULL_RTX;
/* Create (minus -C X) instead of (neg (const (plus X C))). */
if (n_ops == 2